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Nakauonuma (中魚沼郡, Nakauonuma-gun) is a district located in Niigata Prefecture, Japan.
As of July 1, 2019, the district has an estimated population of 9,218 with a density of 54.2 persons per km2. The total area is 170.21 km2.
The district consists of only one village:
Tokamachi-shi, Kawanishi-machi, Nakasato-mura, Matsudai-machi and Matsunoyama-machi were incorporated into a newly established Tokamachi-shi as of April 1, 2005.
十日町市は、平成17年4月1日に旧十日町市、川西町、中里村、松代町及び松之山町の5市町村が新設合併して誕生しました。